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Experiment 9

# Experiment 9 - Experiment 9 Impedance and Frequency...

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Experiment 9 Impedance and Frequency Response of AC Circuits Electrical Engineering Lab EE-P201 Section 38 Performed by: Richard Pfleging Drew Thomsen Lab Write Up by: Richard “Trey” Pfleging Date Performed: 7 April 2011 Lab Due Date: 28 April 2011 Instructor: Armineh Khalili Objective

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The purpose of this experiment is to observe the effects of frequency on AC circuit parameters, particularly phase and impedance. Equipment: DMM 1 – Resistor 5kΩ 1 – Capacitors (4.7nF) 1 – Inductor .2H 1 – Function Generator (AC Power Supply) 1- Oscilloscope (Scope 1- DMM Procedure 1. Connect the circuit according to Figure 1. Set the function generator to SIN and Voltage to 5V. Calibrate the frequency with the oscilloscope and the Va with the DMM. V R , V L , and Θ are all measured for frequencies ranging from 1000Hz to 10000Hz in 1000Hz increments. Equation 1: X L =2*pi*f*L= 2*3.1415*1000Hz*.2H = 1257 Ohms Equation 2: V L =5V(X L )/Sqrt(5000 2 +X L 2 ) = 5V(1257Ohms)/sqrt(5000 2 +1257 2 )=1.22V Equation 3: V R = 5V(5000)/Sqrt(5000 2 +X L 2 ) = 5V(5000)/sqrt(5000 2 +1257 2 )=4.85V Equation 4: I R e jtheta =.972e -15j = 3.29E-07
Table 1: Varying Frequencies with an Inductor Frequency (Hz) VL (V) VR (V) θ IR = VR/5K Ω (mA) IR (mA) Ire^(j*theta ) XL = VL/IR ( ) Ω XL = L ω ( ) Ω XL = VL/IR ( )

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Experiment 9 - Experiment 9 Impedance and Frequency...

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